Edmund Optics Inc.’s TechSpec near-UV achromatic lenses transmit in the 345- to 700-nm range and are designed to minimize the spot size for polychromatic illumination in the 345- to 550-nm region. They are suitable for use in fluorescence applications and for focusing UV light sources such as mercury arc lamps, UV LEDs and tripled Nd:YAG lasers. An alternative to air-spaced doublets and triplets in the UV, the lenses feature a cemented design and provide >90% transmission from 360 to 700 nm and >50% at 334 nm, with no spherical aberration or coma. They are available in 12.5-mm-diameter models in 25-, 30-, 40-, 50- and 60-mm effective focal lengths, and in 25-mm-diameter models with effective focal lengths of 50, 60, 75, 100 and 125 mm. All have a UV-VIS coating.